Cylinder honing element



April 12, 1960 H. B. BARRETT 2,932,137

U CYLINDER HONING ELEMENT Filed Deg. 12, 1956 FIG-5 I INVENTOR. HARRY B. BARRETT BY a F f E ATTORNEY Un ted S a e. Paten 19 CYLINDER HONING ELEMENT I Harry B. Barrett, Clayton, Mo. Application December 12, 1956, Serial No. 627,894 4 Claims. c1. s1 1s4.z

This invention relates in general to certain new and useful improvements in cylinder hones and more particularly tohoning devices adapted for use in the homng of automotive brake cylinders.

In the maintenance and repair of hydraulic brake systems, employed in present-day types of automobiles, it is frequently necessary to resurface the interior oroperating faces of the cylinders which form a partof such equipment. This resurfacing operation is ordinarily performed with some type of abrasive or so-called honing" tool which is rapidly rotated against the surface, but existing types of honing tools do not operate effectively in step cylinders, for the reason that the area of the cylinder adjacent to the step is not readily accessible with existing types of tools. Consequently, the honing or grinding usually accomplished in this area is not precisely concentric and cylindrical, in relation to other parts of the surface. In fact, the region adjacent to thestep tends to assume a noticeable taper.

It is the primary object of this invention, therefore, to provide a tool capable of finishing, smoothing, polishing, and honing the internal cylindrical surfaces of hydraulic brake cylinders as well as other types of similar cylindrical surfaces.

It is also an object of this invention to provide a cylinder hone which can be easily and conveniently adjusted to fit internal cylindrical surfaces of various different sizes and axial conformations.

It is another object of the present invention to provide a cylinder hone which is uniquely adapted for honing stepped cylinders as well as straight bore and single end cylinders.

With the above andother objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in theclaims.

In the accompanying drawings:

Fig. 1 is a side elevational view of a cylinder hone equipped with honing elements constructed in accordance with and embodying the present invention;

Fig. 2 is a perspective view of a honing element constructed in accordance with and embodying the present invention;

Fig. 3 is a transverse sectional view taken along line 33 of Fig. 1;

Figs. 4 and 5 are diagrammatic longitudinal sectional views of a stepped cylinder respectively illustrating the various honing operations which can be performed with the honing element of the present invention;

Fig. 6 is a side elevational view of a modified form of honing element constructed in accordance with and embodying the present invention.

Referring now in more detail and by reference characters to the drawings, which illustrate practical embodiments of the present invention, A designates a cylinder hone of a type more specifically and fully described in my co-pending application Serial No. 590,290, filed June 8, 1956, now Patent No. 2,805,528. The cylinder hone 2,932,137 Fi tered err: 2 999.

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A, while differing in many material and significant ree spects from other cylinder honing tools, nevertheless, in common with many cylinder honing tools, includes a plu= rality of forwardly and outwardly inclined arms 1, each of which is provided at its outer end with a pair of down+ wardly turned ears 2, 2, having axially aligned apertures 3, 3', respectively. 1

Provided for removable and replaceable disposition upon the honing arms 1, are honing-elements B which comprise a U-shaped stamping 4, integrally including a flat bight member 5 and two depending marginal flanges 6, 6, each of which is in turn provided with downward ear-like continuations or tabs 7, 7, respectively. Drilled or otherwise formed in the tab 7 are three longitudinally spaced apertures 8, 9, 10, and similarly formed in the tab 7' are three matching apertures 8', 9', 10, respectively. Adhesivelybonded to the upper face of the bight portion 5 is a thin rectangular abrasive facing or stone 11 which is slightly narrower than the bight element 5, but extends longitudinally the full lengththereof, substantially as shown in Fig. 1.

The honing-element B is of such dimensions as to fit loosely around and externally upon the ears 2, 2', of-the arms land is secured thereto by a conventional cotter pinflllwhich is threaded through the aperture 2, 2', and also through .a selected pair of'the apertures 8, 8, 9,9, or 10, 10. In other words, by selecting any one of these three pairs of apertures, the honing-element B can be disposed in symmetrical position around the end of the arm 1 or can be offset forwardly or rearwardly in the positions respectively shown in Figs. 4 and 5. Thus, as shown in Figs. 4 and 5, the outward pressure applied against the stone 11 by the arm 1 can be intensified either at the forward tip or at the heel thereof. By this means it is possible to grind to a uniform cylindrical surface throughout the length of the bore of a step cylinder and all the way up into the area directly adjacent to the step as shown in Fig. 4, and also to grind the reduced interior portion of the step cylinder uniformly as shown in Fig. 5. The honing or grinding can be efficiently accomp-lished without undesired taper on either side of the stepped portion of the cylinder.

It is also possible to provide a modified form of honing element B which is substantially similar in all respects to the previously described honing element B except that it is provided with tabs 13, 13', having an elongated slot 14, 14, the upper margins of which are indented to provide three lengthwise spaced notches 15, 16, 17, and 15, 16', 17, respectively. The honing element B can be fastened to the arms 1 by a cotter pin or any other suitable means (not shown), and can be adjusted lengthwise by lodging such cotter pin or similar fastening element in any one of the pairs of notches 15, 15', 16, 16', or 17, 17'.

It should .be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the cylinder honing element may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A rotary honing tool adapted to hone the internal stepped cylindrical surface of a work piece, said tool comprising a cylindrical member, divergent arms extending forwardly from said member, the forward ends of said arms adapted to swing and press radially outwardly as the tool rotates, a honing element for each arm, said honing element having a body member provided with an abrasive facing and a pair of spaced edge flanges coextensive with the body member projecting away from said abrasive facing and means removably securing the Means-r V r forward end of each of said arms at various different 1ongitudinal positions on the flanges of a honing element whereby the outward pressure of said abrasive facings against said internal cylindrical surface may be varied, the flanges of said body member .having a pair of trans: versely aligned longitudinal slots and transversely aligned longitudinally spaced recesses in the upper edges of said slots, said securing means comprising a pin in the forward end of an arm engaged in a selected pair of said aligned recesses. I

'2. A honing tool as defined in claim 1, said removable securing means also comprising depending longitudinal ears on the forward end of each arm, said ears lying adjacent the inner faces of the flanges of an associated body member, said .pin interconnecting said ears and .flanges.

3. A rotary honing tool adapted to hone the internal forwardly from said member, the forward :ends of said arms being. adapted to swing and press radially outwardly as the tool rotates, a honing element for each arm, said honing element having a body member provided with an abrasive facing extending substantially the 'full length of the body member, said body member also being provided with a pair of spaced flanges substantially co-extensive in length with the body member and projecting away from said abrasive facing, said flanges each having an outwardly projecting tab located along a. mid-portion stepped cylindrical surface of a work piece, said tool comprising a cylindrical member, divergent arms extending of its longitudinal edge and being substantially 8110 1. in the longitudinal direction than the longitudinal dimension of its flange, said tabs each having a plurality of longitudinally spaced apertures, each aperture in one tab being transversely aligned with the corresponding aperture in the other tab to form transversely aligned pairs of apertures, and means removably securing the forward end of each of said arms at various different longitudinal positions on the tabs of a honing element whereby the outward pressure of said abrasivefacings against said internal cylindrical surface may be varied, said securing means comprising a pin in the forward end of an arm engaged in a selected pair of said aligned apertures.

4. A honing tool as defined in claim 3, said remov-g able securing means also comprising depending longitu-- dinal ears on the forward end of each arm, said ears lying adjacent the inner faces of the tabs of an asso-- ciated ,body member, said pin interconnecting said ears and tabs.

References Cited in the file of this patent UNITED STATES PATENTS 783,464 Root Feb. 28, 1905 1,727,844 Tompkins Sept. 10, .1929 2,118,720 Zimmerman May 24, 1938 2,736,146 Brooks Feb. 28, 1956 FOREIGN PATENTS 368,580 Italy Feb. 18, .1939 

